CVE-2026-87119

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Source

https://cve.org/CVERecord?id=CVE-2026-87119

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-87119.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-87119

Aliases

EEF-CVE-2026-87119
GHSA-p9fv-9w58-95x2

Published

2026-09-22T11:16:56Z

Modified

2026-09-24T03:47:03Z

Severity

8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

mpp Tempo subscription key authorization is not bound to the issuing challenge, allowing a captured activation credential to be replayed

Details

Authentication Bypass by Capture-replay in ZenHive mpp allows an attacker holding a captured subscription activation credential to charge the payer repeatedly.

The payer signs a Tempo KeyAuthorization over the chain id, key type, key id, expiry, limits and scopes only, with nothing tying it to the challenge that prompted it. MPP.Methods.Tempo.KeyAuthorization.verify/3 in lib/mpp/methods/tempo/key_authorization.ex pins each of those signed fields against the subscription request, and the access key it pins is a static per-endpoint server key, so one signed authorization verifies against every challenge the server issues for the same subscription terms. MPP.Methods.Tempo.Subscription.activate/4 deduplicates activations by challenge id, so presenting the captured credential under a fresh challenge produces a different dedup key, claim_activation succeeds, and the subscription transaction is built and broadcast again. Each replay charges the payer's wallet a new first-period settlement and re-authorizes the server key, bounded only by the subscription expiry and the chain's own semantics for re-installing an existing key.

This issue affects mpp: from 0.14.0 before 0.16.2.

Database specific

{
    "cna_assigner":  "EEF",
    "cwe_ids":  [
        "CWE-294"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87119.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "introduced":  "db464dfa9a86ccda58f0827101f6da6bd8aafa78"
                },
                {
                    "fixed":  "4b6eaec02af0e8485cfb4ff68f467d075ed5dd6f"
                }
            ],
            "source":  "AFFECTED_FIELD"
        }
    ]
}

References

Affected packages

Git / github.com/zenhive/mpp

Affected ranges

Type

GIT

Repo

https://github.com/zenhive/mpp

Events

Introduced

ad394b7df40e014eefb9f2f5ca2127326a005c3f

Fixed

3b7e43abf60fa30c40985e4043965ec67791b4dc

Fixed

4b6eaec02af0e8485cfb4ff68f467d075ed5dd6f

Fixed

db464dfa9a86ccda58f0827101f6da6bd8aafa78

Database specific

Show details

{
    "extracted_events":  [
        {
            "introduced":  "0.14.0"
        },
        {
            "fixed":  "0.16.2"
        }
    ],
    "source":  [
        "DESCRIPTION",
        "REFERENCES"
    ]
}

Affected versions

v0.*

v0.14.0

v0.15.0

v0.16.0

v0.16.1

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-87119.json"